Mortgages
⏱ 4 min read
📅 Updated May 2026
Interest Only Mortgage UK 2026: How It Works and Who Qualifies
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Part of our UK mortgage rates guide. See the main pillar for the full lender comparison, FRN-verified best buys by LTV band and worked-example payments: Best Mortgage Rates UK 2026.
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What is an interest only mortgage?An interest only mortgage is a home loan where your monthly payments cover only the interest charged, not the loan itself. At the end of the term, the full original loan amount (the capital) is still owed and must be repaid in a single lump sum. Monthly payments are significantly lower than a repayment mortgage, but you build no equity through your payments. Interest only mortgage: monthly payments cover interest only. At the end of the term, you still owe the full loan amount. You must have a credible plan to repay the capital at the end. Interest only vs repayment mortgage comparison| Feature | Interest only mortgage | Repayment mortgage |
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| Monthly payment | Lower — interest only | Higher — interest plus capital | | Equity built through payments | None | Yes — growing over term | | Capital owed at end of term | Full original loan | Zero — fully repaid | | Risk | Higher — repayment plan required | Lower — loan reduces each month | | Who it suits | High earners; investors; equity-rich | Most residential borrowers |
Monthly payment comparison exampleOn a £300,000 mortgage at 4.5% interest rate over 25 years: | Mortgage type | Monthly payment | Total paid over 25 years | Capital remaining at end |
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| Repayment | £1,666 | £499,800 | £0 | | Interest only | £1,125 | £337,500 | £300,000 still owed |
Who can get an interest only mortgage in the UK?Interest only mortgages are available in the UK but with strict eligibility criteria following the 2014 Mortgage Market Review. Lenders typically require: - A credible repayment vehicle to repay the capital at maturity (e.g. investments, pension lump sum, sale of property)
- Higher income — most lenders require household income of £75,000 or above
- Significant deposit or equity — typically 25 to 50% LTV
- Minimum loan size — many lenders only offer interest only above £250,000 to £300,000
- A maximum loan size relative to your repayment vehicle
What repayment vehicles do lenders accept?| Repayment vehicle | Accepted by most lenders? |
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| Sale of the property (downsizing) | Yes — if sufficient equity | | Stocks and Shares ISA or investment portfolio | Yes — with evidence of current value | | Endowment policy | Yes — for legacy policies still in force | | Pension lump sum | Yes — with pension statement evidence | | Inheritance | Rarely — too uncertain | | Savings account | Sometimes — if sufficient balance projected |
What are the risks of an interest only mortgage?- No equity built — unlike a repayment mortgage, your debt does not reduce
- Repayment vehicle shortfall — if your investments perform poorly, you may not have enough to repay at maturity
- House price risk — if property values fall, the sale proceeds may be insufficient
- Switching difficulty — tighter criteria means it is harder to switch lenders at remortgage time
- Retirement risk — many interest only borrowers face large capital repayments in retirement
Verdict Suitable for high earners with a clear repayment plan Interest only mortgages suit specific borrowers: high earners using the payment saving to invest, property investors, or those with a clear asset that will repay the capital. For most residential borrowers, a repayment mortgage is safer and builds equity over time. Frequently asked questionsCan I get an interest only mortgage as a first-time buyer? Rarely. Most lenders restrict interest only mortgages to existing homeowners with significant equity. Some specialist lenders may consider first-time buyers with very large deposits (50%+) and high incomes, but it is not a mainstream product for new buyers. What happens if I cannot repay at the end of an interest only mortgage? If you cannot repay the capital at maturity, your lender will typically give you time to sell the property, switch to a repayment mortgage, or find alternative financing. You should not wait until maturity if you are concerned — contact your lender early. Can I switch from interest only to repayment? Yes. You can switch part or all of your mortgage from interest only to repayment at any time, subject to affordability checks. Making even partial capital repayments alongside interest only payments helps reduce the end-of-term debt. Are interest only buy-to-let mortgages common? Yes. Interest only is much more common for buy-to-let mortgages than residential ones. Most landlords use interest only to maximise monthly cash flow, with the intention of selling the property at the end of the term to repay the loan. |
Part of our complete guide: UK Mortgage Rates April 2026 - Current Rates & Guide → Find a whole-of-market mortgage broker →
Editorial Disclaimer
The content on Kaeltripton.com is for informational and educational purposes only and does not constitute financial, investment, tax, legal or regulatory advice. Kaeltripton.com is not authorised or regulated by the Financial Conduct Authority (FCA) and is not a financial adviser, mortgage broker, insurance intermediary or investment firm. Nothing on this site should be construed as a personal recommendation. Rates, figures and product details are indicative only, subject to change without notice, and should always be verified directly with the relevant provider, HMRC, the FCA register, the Bank of England, Ofgem or other appropriate authority before any financial decision is made. Past performance is not a reliable indicator of future results. If you require regulated financial advice, please consult a qualified adviser authorised by the FCA.
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Chandraketu Tripathi
Finance Editor · Kaeltripton.com
Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.
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